Tractor hitched plow



Nov. 18, 1952 M, T. HEDQUIST ETAL TRACTOR HITCHED PLOW 6 Sheets-Sheet 1Filed July 19, 1944 Nov. 18, 1952 M. T.\HEDQU|sT Erm.

TRACTOR HITCHED PLOW 6 Sheets-Sheet 2 Filed July 19, 1944 @@MUAVAH .wwf

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Nov. 18, 1952 M. T. HEDQuls'r ETAL TRACTOR HITCHED PLOW 6 Sheets-Sheet 3Filed July 19, 1944 H MW .m @gu uw nm. ce @Hw NOV- 18, 1952 M. r.HEDQul-sT Erm. 2,618,212

TRACTOR HITCHED PLOW Filed July 19, 1944 6 Sheets-Sheet 4 IN VEN TOR./17/4 70A/ 7.' Aid-vayas? ,Dn wo D. /17/9 f//s/n/ /a/ M E@ Ey.

Nov. l8`, 1952 M. T. HEDQUlsT Erm.

TRACTOR HITCHED PLOW 6 Sheets-Sheet 5 Filed July 19, 1944 A 7 P .s n Amw WN Mw k M ,Nj J r ma A M mp. ZM v.. B

NOV 18, 1952 M. T. HEDQuls'r x-:TAL 2,618,212

TRACTOR HITCHED PLOW Filed July 19, 1944 6 Sheets-Sheet 6 Mand??Patented Nov. 18, 1952 UNITED STATES PATENT OFFICE TRACTOR HITCHED PLOvVApplication July 19, 1944, Serial No. 545,648

6 Claims.

This invention relates to a tractor hitched plow of the type which ismanually controllable as to depth of plo-wing, as to level, and as tolift.

An object of the invention is to provide a plow of this character whichis so constructed and organized that its various adjustments arefacilitated, so much so that they may be made conveniently by a singleoperator of the plow or plows.v The control of the depth at which theplow or plows operate is regulated by a single hand lever. Correction'or compensation incident to the fact that one wheel of the tractorrides in a furrow, while the other rides on unplowed ground is alsounder the control of a single lever. The lift mechanism is largelyAconventional and power operated, but it is combined in a special waywith a bracing structure interconnecting the beams of the plows where atleast two plows are employed.

Another object of the invention is to provide a tractor hitched plow ofthe character described which may be readily and economically fabricatedfrom available materials, yet is simple in construction, compact andclose in its organization, highly eiiicient in operation, and, asindicated, readily and easily controlled.

These objects of the invention and other ancillary advantages areattained by the mechanism, construction, and arrangement illustrated inthe accompanying drawings forming part hereof, in which: Y p

Fig. 1`is a View partly in side elevation and partly in verticallongitudinal cross section showin'g one form of the invention;

Fig. 2 is a'fragmentary sectional view taken on line 2-2 of Fig. 1 andshowing the trailing end of the tractor and the way in which the plowbeams are hitched thereto; o o

Fig. 3 is a fragmentary view in vertical cross section taken on line 3 3of Fig. 2 and illustrating especially the provision madefor tilting theplows to compensate or correct for the tilt of the tractor' incidentaltol the fact that one wheel thereof rides in the furrow while the otherrides on unplowed ground;

Fig. 4 is a fragmentary sectional view taken on line 4 4 of Fig. 2 andillustrating the bearing provided at the other end of the hitch whichfunctions to apply the draft toits plow beam and yet permits therotation required for variation in depth, for lift, and also theclearance or sloppy fit permissive of the required corrective tilt;

Fig. 5 is a view taken on line 5-5 of Fig. 1 to illustrate the liftmechanism overlying the plow beams and their hitches, and alsoillustrating, to some extent, the construction of the hitches;

.- same vertical plane as` its' longitudinal axis.

Fig. 6 is a fragmentary view in top plan showing the plows, the plowbeams therefor, their braces, portions of their hitches, and the coulterwheel combined with the rearward end of one of the plow beams;

Fig. 7 is a fragmentary view in side elevation illustrating theadjustment provided between one of the hitches and one of the plow beamsto take care of side draft;

Fig. 8 is a fragmentary detail view in side elevation showing the plowsto which the coulter wheel it attached, and also illustrating the meansfor its attachment and adjustment;

Fig. 9 is a fragmentary view on an enlarged scale and in rear elevationof portions of the adjustment mechanism shown in Fig. 8; and

Fig. 1'0 is a view in rear elevation of the structure shown in Fig. 8with parts broken away and shown in section for the sake ofillustration.

Referring to the drawings it will be seen that the invention comprisesin general a tractor, fragmentarily and diagrammatically illustrated andindicated as a whole at T. Plows designated generally at P and P trailthe tractor. The plows P and P are attached to plow beams designatedgenerally at B and B. The plow beams B and B' are connected by hitchesor draw bar connections designated generally at H and H to the tractor,these hitches being so constructed and organized as to apply the drafttc the plows and also to provide for leveling, tilting and liftingthereof.

To des-cribe the structure with more particularity, an angle iron I issecured by bolts and nuts I I to the trailing end of the tractor T, asfor example, to the transmission housing thereof. The angle iron I0 iselongated in structure and extends transversely with respect to thetractor and its transmission housing, and its ends, as clearly shown inFigs. 2 and 5, project beyond the sides of the portion of the housing towhich the angle iron Ill is attached.

Bearing brackets I2 and I3 are xedly secured to the projecting ends ofthe angle iron I0. These bearing brackets are both of U-shapedconstruction, both have their body portions welded or otherwise securedto the vertical flange of the angle iron I0, and both have their legsextending forwardly from such flange. While similar in constru-ction,they are, however, of different dimensions and proportions, the bearingbracket I2 being larger than the bearing bracket I3. In general, theyare designed and adapted to provide a support fora main shaft I5 and toso support the shaft I 5 that it may be rotated about its own axis ormay be tilted in approximately the For these purposes the bearingbracket I3 may be constituted as illustrated in Fig. 4. As is shown, thebracket I3 has its legs I3a and its body I3b made up of separate partswhich, of course, are suitably secured together, preferably welded. Thebracket structure IZB is completed by a bolt and nut IV which looselyconfines the shaft I5 for rotation and with such a sloppy fit or suchclearances as will permit it to be tilted in the Vertical plane of itsaxis.

The bearing bracket I2 is shown to advantage in Fig. 3. It is ofintegral construction in that,

its body portion I1 and its rearwardly projecting legs IB are allconstituted of one piece of metal. A wear plate I9 is applied to theforward side of the body I7 of the bracket I2. As before,` thev bearingstructure aiorded by the bracket I2 and its wear plate I9 is completedby a bolt or barl 2U, which in this instance, may be held against axialdisplacement by cotter pins 2|.

The shaft I5 i's thus supported in the manner described by the bearingbrackets I2 and I?. for rotation and'A for tilting movement` and, as'`will be seen in Figs. 2 and 5, its ends project well beyond thefbearingbrackets I2 and I3?.

Thev hitch I-Iv is attached to the portion of the shaft I5 whichprojects to the left beyond the bearing bracket I2 as the structure isviewed in Figs. 2 and 5, whereas the hitch H is attached tof-thefportionof the shaft I5 which projects to the right of the bearing bracket I3 asviewed in Figs. 2 and 5.

While the hitches H and H are of similar constructionY they differ intheir particular design inorder to adapt them to perform their respectively` different adjustments; They have, of course, incommon the dutyor functiono applyingv the draft to their respective plow means;

Each, of these hitches is of' double barredv con.- struction forpurposes ofruggedness and strength. TheA hitch H comprisesa bar havingits intermediate, portion reversely bent so that its rear- Ward end, isoiTset from its forward end. The forwardend, of ba11`25 is rigidlyattached to the lshaft I5.v The other element of the hitchlH comprises astraight barl 26 securely boltedi as, at 2J. to the bar 2.5. Similarly,the hitch H comprises alv pair of bars 28- and 29, eachv ofV which,however, is straight, and each of which has. its forward end welded.orotherwisesuitably secured toits projecting end of the shaft I5. Thebars 28a11d 29Y are parallel and are arranged intrans-` versely spacedrelation; in.- fact their spacing is. somewhat greater tha-n thespacingof the spaced: DQItiQns. of the; bars- 2.5.v and 26 of thevhitch- HA.V

Connections are supplied betweentherearward ends of the bitchesy andA H"and theirY respective; plow beams, and while, these hitches. are, inmany respects, similarinconstructiomthey-vary; especiallyin theirmanner` and attachment to the plowbeams for the purpose of correcting orc ompensating 'sidel draft.l Both such;- connections comprise metal;plates, the metalk plateinterjconnecting the hitch-H and theplowfbeamzBfbe-v ingfdesignated generally at; SI1y (see Figs. 36; andf7)?, and the metal'fplateinterconnecting the. hitch; H' and the; plowbeam B' being designated gen erally-at 3|l The: plates3. and: 3.I arepivotallyv interconnected. with. thehitches, this pivotal interconnection being accomplishedy in the instance; ofthe plate 3.Il1withits hitch Hi by meansf of a comparatively short'pivot pin. 32, (see Fig.2),y cotter pins and.- Washers 33being provided toprevent axialdisplacement of. thepivot: pin- 32.. A:

tan in Fig. 7. This adjustment is provided to uit the plow beams withrespect to each other, and

this in, such a manner that compensation or correction shall be had forthe side draft of a tractor pulled-(pkw. For:v this purpose the plate 30is pivotallyconnected' by a vbolt and nut 31 to the forward end of itsplow beam B. The plate 30 may turn about its bolt and nut 31. It isheld. howeven in. various angular adjustments by means of a second nutand bolt 38, the pin of which bolt and nut 38 passes through an arcuateslot 39 in the plate 39 and also, of course, through abel-t; hole. inthe plowbeam B.. Toinsure. rigidity of adjustment the plate` 30:1ra-stair integral over'- lapping ear orl lug-like; structuren; equippedwith`- a set screw 4,:I and` lock nut. 42 which, when appropriatelytightened, insures; theselected adjustment.

The plow beam structures` Bv and: B! are. also similar in nature inthatvboth, are constructed of strap irony of suitablev gaga. the; bar of'the. plow beam B being; designated at 4.5, and the 'bar structureof; thebeam B, whichl is composite, being inclusiveof two bars 46 and; 411(seeFig. 6b'. This is necessary because; the plow P is behind the plow Pand the longer reach is. necessary. The bars 4.6v and M' areboltedtogether as indicated at 48fand49i Theplow. beams Band-B areFcross braced and this in4 a special. manner; The desired bracing is hadby having two braces one designated gem.Y erally. at 59- and the otherat 5I.. The brace 50 comprises simply two metal; strips 52: and 53:11amingv theirends. lugged and' secured. to the plowl beamsB and Bf. Oneofthefstripsr'. is: attached toy its plow beam Brby the bolt. and nut 49.Nwhichy takespar-t in` securing the-bars of the; plowbeamz B together.The other strip: 52- is secured Atov-the,

plow beamB! by a separate bolt and nut 5,41.A

The brace 5 I- isI diagonally arranged., Itszalsor constructedY ofstrap4 iron and inclu-desl a. strip: 55: having a. v-shaped end 56securedy by bolts andi nuts 51 to the plow beam B'. The other stripty58.. of thebrace 5I has itsrearwardI end secured by bolts. andl nuts 60to theplow beam-.13ay In both instances themetal: strips; which`constitute the braces; may be` adjustedl lengthwise with.respectto-eachother,A and-gfmay'be xed'in any adi-a justment' bysuitablebolts. and. nuts cooperabl'ej with a series of boltholesprovided in the strips-f and.- adapted. to bebroughtinto; thedesired: registry; In the instance of thet brace thegbolts; and nutsformaintainingthe; desiredadiustment; is, designated at. 6;!Ingd'fhefinstanceY off the: brace 5 l(ggz-responding bolssz` nuts: are;designated? 2,

In order to control the depth atzwhicir. the ploWS; work. the. presentintention. proposes to bambine withthepivotal connection between the.plate'Sl; andthe hitch. a. novel form ofimam ual'ly` operable adjustingmeans; This; means. in. cludesv ahand: lever on control' element:V 9.5(see Fig; 191 in the form; of: a bell: crank, the. elbow. off which; is;pii/otedI as.; ati; lili; oni a. U -shaped .bracket Edi secured. by.boltsf andfnuts 69; andK a:v clamping plate Ion. the. axlehousingroffthe tractor;V 'Ji-'he shortV armi 1.0; of, the@ leven 65;.ispivotedc to.A the: upper: endoi; atlinln` 'IF-Ii` i'lhe; lower end4of: the;

link 1| is pivotally interconnected with the pivot pin 34 (see also Fig.2). When the operator rocks the lever 65 he raises and lowers the pivotpin 34. This is the hitch point.

As is well known, the depth ci operation of the common type of moldboard plow is largely dependent upon the height of the hitch point, theplow finding a level below the surface of the ground dependent upon theheight of the hitch. The plow is not pressed down into the ground nor,on the other hand, is it supported, at least to any practical extent,from the drawing vehicle. It seeks its own level and is guided orcontrolled by the height of the hitch so as to maintain the desireddepth of plowing.

As diagrammatically illustrated, the lever 65 is releasably secured inany adjustment by the conventional hand operated detent 12 cooperablewith a notched quadrant formed on one of the vertical plates of thebracket 61.

At the opposite side of the machine from the lever 65 is a lever orcontrol element 15 similar in construction to the lever 65, and like thelever 65, fulcrumed by a bolt and nut on a bracket 11, also supported onand secured to the axle housing by bolts and nuts 18 and clamping plates19. The lever 15, however, has an entirely different function. Itspurpose is to tilt the shaft |5 so as to maintain the plows level,notwithstanding the fact that one wheel of the tractor is riding in thefurrow while the other wheel of the tractor is riding on unplowedground. To accomplish this purpose the short arm 8i! of the lever 15 hasits forward end pivotally connected to the upper end of alink 8|. Thelower end of the link 8| is pivotally connected to the shaft l5. Thelever 15 is also equipped with a manually releasable and spring engageddetent 82. When the detent of the lever 15 is released and the lever isrocked, the left hand end of shaft l5, as viewed in Figs. 2 and'5, israised or lowered, depending upon the direction in which the lever 15 ismoved. As previously indicated, this tilts the shaft I5 and the bearing3 permits such tilting. As a consequence, the plows are levelednotwithstanding the tilt of the tractor.

, Also combined with the plow beam structure is a lifting mechanismdesignated generally at L. This mechanism is largely of a conventionalconstruction. It includes a yoke 82 constructed of strap iron (see Fig.5) and converging to pivotally interconnect as at 83 with a slidingconnection 85 interiitted with a supporting rod 88, having collars 81pinned thereto and having springs 88 interposed between the collars 81and the sliding connection 85. The lower end of the rod 86 is pivotallyinterconnected with a pivot pin 89 Fig. 6 mounted in ears 9B, fixed to abracket 9| attached to the brace 5| by the same bolts 62 used forsecuring the parts of the brace 55 together.

The lift mechanism is largely of conventional construction and needs nofurther description. It is usually power operated, but as the powerlmeans for operating it is no part of the present invention, it is notnecessary to illustrate or describe it. It is sufficient to indicatethat bracket 95 may be attached to the yoke 82 and connected by suitablerod 96 to the operating mechanism.

One other advantage of the invention is that the spacing of the plowsmay be adjusted with respect to the construction heretofore described.For example, when it is desired to use plows of a larger size than thoseshown it is necessary to space the beams agreater distance apart. This-may be accomplished as illustrated at dotted lines on Fig. 6 byreversing the relation of the strips of the brace 5| and of the stripsor bars that constitute the plow beam B, and re-bolting the strips intheir oppositely displaced relation.

The combined land side pressure of the plows P and P' is taken by a tailor colter wheel |08. rThe tail wheel lil is journaled in well-knownmanner on an arm Il which is connected with beam B by an adjustingmechanism generally designated as |02 Fig. 6. As better seen in Figs. S,9 and 10, mechanism ||l| comprises a plate H1 having forwardly extendingears I8 andl I I9 disposed on opposite sides of beam 41. Ear ||9 ispivoted on a bolt or the like |28 while ear ||8 is slotted at I2! andengaged by a bolt |22 in beam 46. Plate |l1 therefore can be tiltedforwardly or backwardly when bolts |26 and |22 are loose, and theadjustment can be maintained by tightening the bolts. Such adjustmentraises or lowers tail wheel 53.v

A plate |23 is clamped against plate |I1 by a bolt |24 above which plate|23 and arm |8| may pivot relatively to plate |1 and beam B.l In thisway, the tilt of wheel |68 may be adjusted. For facilitating the iirstmentioned adjustment of plate i |1, a set screw |25 is threaded in plate|23 and passes through a slot |26 in above mentioned.

plate l1. Set screw |25 engages beam B thereby providing for a fine orgradual adjustment of plate il? when bolts |22 and i2|l are loose.

`When the desired adjustment is reached, the bolts are tightened as iswell understood. l

An extension |21 is iixed with plate ||1 and ear lili and has a setscrew |28 bearing against the edge of plate |23 for securing a lineadjust!- rnent of the latter when bolt |24 is loosened. Shifting ofplate |23 is possible because of the slot |26 in plate Iil. A lock nut|29 is provided on screw |28 to hold the adjustment. Withv thismechanism, tail wheel |00 may be readily adjusted to run in the furrowand carry the weight of plows P and P as well as the landside pressure.

Tractor T is equipped with a drawbar |38of suitable or well knownconstruction, in the present instance pivoted on a pin |3| and guidedfor swinging movement on a plate |32 by means O-f a roller |33. Plate|32 is suitably braced. At times it is desired to use the tractor forpulling a load connected to draw bar |36, perhaps for short periodsduring the plowing season. lObviously, beam structure B and B' wouldinterfere with such use. However, the interferring structure may beremoved very readily. With the removal of a few connections, the tractormay be driven away from the lifting mechanism L and beams Band B leavinglevers 65 and 15 and their connections, and rods 96 in place on thetractor. It is to be noted that these parts do not interfere in any waywith the use of draw bar |36 nor with numerous other uses for which thetractor might be needed for a short time. Of course, the mentioned partscan be replaced just as readily when it is desired to continue plowing.When the plowing season is over, shaft l5 and lifting mechanism L arereadily removed. VSince cross bar |0 and its functionally associatedparts do not encumber the tractor, nor interfere in any manner with anyuse to which it may be put, these members may remain permanentlyattache'd to the tractor.

While we have shown and described one construction in which theinvention may be advantageously embodied, it is to be understood thataerea-111s Lfor the purpose of illustration or example, and

that various changes in the size, shape, and

arrangement ofthe parts may be made without departing from the spirit ofthev invention or' the scope of the subjoined claims.

- Whatlwe claim is:

I. In-a tractor hitched: plow for use with a tractorV having a rearaxle, the combination comprising a cross member secured to the trailingend of. thev tractor and projecting beyond' the sides thereofforwardly-of said rearv axle, a main shaft, bearing brackets xed to theend portions of vsaid cross' member, a bearing in one of saidl bracketsin'Y which the main shaft is supported for rotation the other bearingbracket having means coacting with the main shaft to constrain it torotation and to vertical movement in the. pla-ne of the longitudinalaxis of the shaft and about said bearing as a fulcrum, bar-like hitcheshav- Ving their forward ends rigidly connected to the` main shaft andextending therefrom to a point rearwardly of said rearr axle, plow beamsextending rearwardly from the bar-like hitches, plows carried by saidplow beams, connecting plates fastened to the forward ends of the plowbeams andl pivotally connected to thev rearward ends of the hitches toprovide the hitch pointl of the plows, a control lever operativelyinterconnected with one of said pivotal connections and adjustable toraise and lower the hitch point of the plows to regulate the depth ofoperation of the plows and a second control lever operativelyinterconnected with the end portion of the main shaft that is supportedfor rotation and for verticali movementand adjustable to tilt the mainshaft and consequently the plows to compensate forv tilting of thetractor.

2. In a tractor hitched plow for use with a tractor having a rear axle,the combination comprising amain shaft disposed transversely of thetractor, bearings carried at the sides of the tractor toward the rearthereof but forwardly of said rear axle for supporting said shaft forrocking aboutl its longitudinal axis, one of said bearings being adaptedto provide for up-and-downv tilting of the shaft in the plane of itslongitudinal axis and the other'` of said bearings being adapted toprovide also for substantially vertical displacementof 'said shaft,bitches extending rearwardly ifrom said shaft in rigid relation theretoto points rearwardly of said rear axle, plow beams having .pivotalconnections, rearwardly of said rear' axle, with and" extendingrearwardlyv from said hitches, plows on. said. beams, a control elementoperatively interconnected with one of said pivotal connections; andadjustable to rock the associated hitch and said shaft to regulatey theheight of the4 hitch points of said beams andaccordingly thedepth of'operation of saidplows, and a second control element operativelyinterconnected with said shaft totiltthe saineY and consequentlytheplows to compensate for tilting ofthe tractor;

3^. In a; tractor hitched plow for: use with a tractor having. area-raxle, the combination comprising a main shaft disposed transversely ofthe bearings being adapted to provide for upand-down tiltingv of theshaft in the plane ofi' its longitudinal axis and the` other of saidbear-- Y ings being adapted to provide for substantially verticaldisplacement ofv said sha-ft, hitches extending rearwardly irom saidshaft in rigid rela;-

tion, thereto tov points rearwardly of said rear axle, plowbeamshavingpivotal connections, rearwardly of said rear axle, with andextending rearwardly from said hitches, plows on said beams, a controlelement operatively connected to rock said' shaft to regulate the heightof the hitch points of said beams and accordingly the depth ofopera-tion of said plows, and a second control element operativelylinterconnected with said shaft toA tilt the same and consequently theplows to compensate for tilting of the tractor.

4. In a tractor hitched plow for use with a tractor having a rear axle,the combination comprising a main shaft disposed transversely ofthetractor, bearings carriedv at the sides of the tractor toward the rearthereof but forwardly of the rear axlel for supporting said shaft forrocking about its longitudinal axis, one of said bearings being adaptedto provide for up-and-down tilting of the shaft inv therplane of itslongitudinal axis and the other of said bearings being adapted toprovide also for substantially vertical displacement of said shaft,hitches extendingrearwardly from said shaft in rigid relation thereto topoints rearwardly of said rear axle, plow beams having pivotalconnections, rearwardly of Said rear axle, with and extendingrearward-ly fromv said hitches, plows on said bea-ms, and a controlelement operatively inter-connected with said shaft to tilt the same andconsequently the plows to compensate for tilting of the tractor.

5. In a tractor hitched plow for use witht a tractor having a rear axle,the combination comprising a main shaft disposed transversely of thetractor, bearings carried at the sides of the tractorl toward the rearthereof but forwardly of said rear axle for supporting said shaft forrocking'aboutv itsV longitudinal axis, one of said bearings beingadapted to provide for up-and-down tilting of the shaft in the plane ofits longitudinal axis and the other of said bearings being adapted toprovide also` for substantially vertical displacement of said shaft,hitches extending rearwardly from said shaft in rigid, relation theretoto points rearwardly of said rear axle, interconnected plow beamsextending rearwardly from said hitches, plows. on said beams, aconnecting plate pivoted to one of the rearwardly extending bitches,means pivotally connecting said plate to one of the plow beams,rearwardly of said rear axle, in vertically offset position, releasablemeans for securing said plate to said beam in various pivotaladjustments with respectA tosaid beam for forward and backward-ladjustment of said beam for causing lateral swinging adjustment of thealignment of said beams and tractor, a control element operativelyinterconnected with one of said pivotal connectionsand adjustable torock the associated hitch and said shaft to regulate the height of thehitchI points. of said beams and accordingly! the depth of. operation ofsaid plows, and a second' control element operatively interconnectedwithl said shaft to tilt the same and consequently the plows tocompensate for tilting of the tractor..

6'.. In. av tractor hitched plow for use with a. tractcr'having a rearYaxle, the combination comprisingA a main shaft disposed transversely ofthe i tractor, bearings carried atther sides ofthe tractor toward therear thereof but forwardlyA of said rear axle for supporting said shaftfor rocking about its longitudinal axis, one of said bearings; being,adapted to provide for up-and-down tiltingV of the shaft. inthe plane".of its longitudinal, axis and, the other of said bearings being adaptedto provide also for substantially vertical displacement of said shaft,hitches extending rearwardly from said shaft in rigid relation theretoto points rearwardly of said rear axle, interconnected plow beamsextending rearwardly from said hitches, plows on said beams, one of saidplow beams having a pivotal connection to one of said rearwardlyextending hitches rearwardly of said rear axle, a connecting platepivotally connected to the other rearwardly extending hitch rearwardlyof said rear axle, means shiftably connecting said plate to the other ofsaid beams, releasable means for securing said plate to said beam invarious positions o1 adjustment with respect to said beam for forwardand backward adjustment of said beam for causing lateral swingingadjustment of the alignment of said beams and tractor, and a controlelement operatively interconnected with said shaft to tilt the same andconsequently the plows to compensate for tilting of the tractor.

MILTON T. HEDQUIST. DAVID D. MAYHEW. ACHIEL VAN DE SAMPEL. ARTHUR J.WHALEN.

10 REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS

